Mathematics Junior High over 4 yearsago

この問題の解き方が分からないのですが教えて貰えませんか🙏

X rample4 8. COMMUNICATION A cell phone tower casts a 100-foot shadow. At the same time, a 4-foot, 6-inch post near the tower casts a shadow of 3 feet 4 inches. Find the height of the tower. 01S ractice and ProblemSolving